ARI SHAPIRO, HOST:
San Francisco is known for the Bay, the bridge, the hills and now self-driving cars. More and more of them are picking up riders on the city's streets. NPR tech reporter Bobby Allyn went to check them out.
BOBBY ALLYN, BYLINE: A video went viral last month. In it San Francisco, police pull over a car with its headlights on. As officers approached the vehicle, someone shouts at them.